Plug-fuse board.



No. 802,553. PATENTED OCT. 24, 1905.

I W. P. BOSSERT.

PLUG FUSE BOARD.

APPLICATION FILED I'EB.14.1905.

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WITNESSES:

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UNITED STATES PATENT OFFICE.

WILLIAM F. BOSSERT, OF UTICA, NEW YORK, ASSIGNOR TO THE BOSSERT ELECTRICCONSTRUCTION COMPANY, OF UTICA, NEIV YORK.

PLUG-FUSE BOARD.

Specification of Letters Patent.

Patented Oct. 24;, 1905.

Application filed February 14, 1905. Serial No. 245,637.

To rtZZ whom, it may concern:

Be it known that 1, WILLIAM F. BossER'r, residing at Utica, in thecounty of Oneida and State of New York, have invented'certainImprovements in Plug-Fuse Boards, of which the following is aspecification.

The invention about to be described has reference to plug-fuse panels orboards of the variety shown in Patent No. 7 38 ,519, granted to meSeptember 8, 1903, upon which the present application is an improvementand has especial reference to the plug-fuse holders' which are providedwith the branch busbars from the main bus-bars in such boards.

Commonly the plug-fuse holders are made from metals of rather highresistance, as brass castings, and are interposed in and are attached tothe branch bus-bars; but I have found that such brass devices are ofvery much greater resistance than sheet metals as, for instance,copper-and are also much more costly, as extra Work is required infiling and smoothing the same in order that they shall present afinished appearance. In carrying out my invention I form the saidholders preferably from heavy sheet-copper by first stamping out a blankand then drawing or pressing the same into the required shape by passingthe blank through a progressive series of dies and forming therein athreaded nut to receive the ordinary commercial fuse-plug and drillingholes for screws and bolts.

The invention also. relates to the combination of such an improvedfuse-holder with the bus-bars, the branch bus-bars, and thesupporting-base of a panel or board, as I will now proceed to describe,and point out in the appended claims.

Of the drawings which form a part of and illustrate the invention,Figure 1 is a plan view of a base panel or board with one of thefuse-plugs omitted from a holder. Fig. 2 is an elevation of the same,one of the fuseholders being represented in section on line a; 00 ofFig. 1. Figs. 3, 4, and 5 are to represent the method of stamping outand drawing or pressing the fuse-holder from sheet, Fig. 3 being a planview of a blank, Fig. 4 an elevation of the same, and Fig. 5 anelevation of a holder as it leaves the last dies.

In the drawings, a represents a slab of marble or slate forming theinsulating base or Tsupport for the respective parts .of the panel orboard, and 1 and 2 are hollow posts to which the leading-in conductorsmay be connected,which are secured to the base a by the bolts 6 6, alsopassing through the busbars 9 and 7, respectively. The bus-bar 7 isconnected to the branch bus-bar 4 by the screw 8, while the bus-bar 9 iselevated to pass over the bar 4 and connects with the branch bus-bar 3by the screw 10, provided. with the nut 11. The parallel branch busbars3 and 4 are preferably of unequal length and are secured to the base aby the bolts 13 at each end thereof, having a fl at head 1 2, upon thetop of the bars. The bolt 13 extends through the base a and is providedwith a nut 27, by means of which the head 12 is drawn down hard upon thebars 3 and a. The heads 12 of the bolts constitute a contact-surface, aswill be explained hereinafter, for the fuse-plug.

The fuse-plug holder A is formed preferably from sheet-copper of theproper thickness, and a blank similar to that shown in Figs. 3 and 4, Ais stamped therefrom. A hole I) is punched at one end and a tubularportion 0 turned down. The blank has an enlarged part c and a tang (Z,and by subsequent operations the enlarged portion a is hollowed orsunken, as 6 and its edges turned up at substantially right angles, as ff, leaving the ring part 7t and the tang or foot (Z in two different andparallel planes, and then a coarse thread 9 is formed on the innersurface of the tubular portion 0 and holes are drilled for theholding-bolts in the foot. When thus formed, the fuse-holder is finishedon an emery-wheel or in any other suitable manner and is ready for use.W'hen the enlarged or intermediate portion e is sunken, as described,and the edgesfturned up, a very strong support is formed, as the saidedges give a bracing and stiffening effect, and the ring 7b is enabledto withstand the thrust put upon it when the fuse-plug B is screwed downhard onto the contact-head 12; but at the same time, since the holder isattached to the base at only one side and constructed as described, itis sufficiently resilient to give or yield, so as to avoid liability ofdamage resulting from screwing the fuse-plug B down too hard on the head12. If the head 12 becomes pitted from sparking produced when thefuse-wire is deflagrated, it can be readily renewed and another put inits place without throwing away the bus-bar.

The fuse-holder A is placed upon the base in such a position that thecenter of the open ing Z) is over the center of the contact-head 12, andeach holder is secured to the base by the screw 14 and the bolt 17. Thebolt 17 is provided with a knurled nut 16 and serves as a binder toconnect branching conductors to the holder.

B represents the common fuse-plug having a porcelain body insulating ametal screw-threaded sleeve and contacting tip i, between which isplaced the fuse-wire, and when in the fuse-holder A the sleeve makesconnection with the ring 7L and the tip iwith the bolthead 12, and thuscontinues the cireuit from the branch bus-bar to the binding screw 17but when the fuse has been deflagrated the circuit is interrupted and anair-gap formed between the bolt-head 12 and the ring it of thefuse-holder in a manner well understood.

I claim as my invention 1. A fuse-plug holder consisting of a holderportion, an intermediate portion, and a single foot portion, all of saidportions being integral and made from sheet metal, the foot portionbeing provided with holes, the intermediate portion being provided withstrei lgthening means, and the holder portion being perforated andinternally threaded.

2. A fuse-plug holder stamped from sheet metal and having one endperforated and threaded and the opposite end formed with a foot havingbolt-holes, the said ends being in parallel planes, and joined by anintermediate portion centrally hollowed or sunken to form supportingedges or sides.

3. A fuse-plug holder stamped from sheet metal and having one endperforated and a tubular portion turned down and internally threaded,the opposite end being formed as a foot having bolt-holes, the said endsbeing in parallel planes connected by an intermediate curved portionhaving its edges or sides bent at substantially right angles.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this th day of February, 1905.

WILLIAM F. BOSSERT.

Witnesses FRANK G. SCOFIELD, FREDERICK T. FoXENBnnenn

